US Patent 7978455 Adaptive transient blocking unit

Patent 7978455 was granted and assigned to Bourns, Inc. on July, 2011 by the United States Patent and Trademark Office.

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Is a

Patent

Patent attributes

Current Assignee

Bourns, Inc.

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

79784550

Patent Inventor Names

Andrew J. Morrish0

Date of Patent

July 12, 2011

Patent Application Number

118911450

Date Filed

August 8, 2007

Patent Primary Examiner

Patent abstract

A variable trip limit transient blocking unit (TBU) is provided. The variable trip limit transient blocking unit circuit includes a transient blocking unit and a low-pass filter, such as an RC circuit having an RC time constant. The RC circuit is disposed to approximate an integrator operating over periods of time that are short compared to the RC time constant. The RC circuit integrates a signal representing an approximated current flowing through the transient blocking unit and triggers a disconnect threshold in the transient blocking unit when a voltage stored across a capacitor of the RC circuit reaches a predefined limit.